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Rear Derailleur for 1984 Centurion Pro Tour 15?

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Rear Derailleur for 1984 Centurion Pro Tour 15?

Old 07-04-15, 05:23 PM
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tttny
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Rear Derailleur for 1984 Centurion Pro Tour 15?

The rear derailleur on my cherished 1984 Centurion Pro Tour 15 failed (snapped off when the gears jammed).

The mechanic at my small neighborhood store, whose work I respect but whose English I don't always follow (partly because I don't know much about drivechain components), installed an inexpensive Shimano 7sis (I think that is a category rather than a specific model), but suggested that I could upgrade to an aluminum model if I wanted. The store was about to close and I didn't have a chance to find out whether the more expensive model worked better, or was just a bit lighter and looked better.

I don't ride very fast, or go up huge hills; mostly I tool around the 5 boroughs of NYC. But I like a forgiving derailleur that shifts smoothly and doesn't drop the chain, especially when I'm going into my lowest gear (28/28).

I'd appreciate any advice.

TIA
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Last edited by tttny; 07-04-15 at 05:30 PM. Reason: Fixed some silly typos.
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Old 07-04-15, 05:56 PM
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You don't mention what your old derailleur was but I guess your bike is friction shifting? You can use almost anything on there but a newer shipmano 105, RX100 or 600 would shift really great.
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Old 07-04-15, 07:07 PM
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If you have a Suntour drivetrain, the Duntour long cage Vx is the way to go. If you have Shimano, then an early Deore is a good choice.
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Old 07-04-15, 07:43 PM
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Originally Posted by Bianchigirll View Post
You don't mention what your old derailleur was but I guess your bike is friction shifting?
Thanks for your reply. Yes, it's friction shifting.

As to what the old derailleur was (photo attached), that's been puzzling me for a while. The brand markings have worn off. It's definitely not the original derailleur, which the catalog at sheldonbrown.com says was a Suntour Le Tech. The original never worked well, and I replaced it after a few months. My memory says that it was a different Suntour, but that's a 31-year-old memory, and I'm not sure I trust it.

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Old 07-04-15, 07:55 PM
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That looks like a le-tech.
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Old 07-04-15, 07:58 PM
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Originally Posted by wrk101 View Post
If you have a Suntour drivetrain, the Duntour long cage Vx is the way to go. If you have Shimano, then an early Deore is a good choice.
Thanks. Again relying on the 1984 catalog, the freewheel is a "Winner 13-28" and the front triple crankset (28/42/50) is a Sugino Aero Tour.

If a current model will work just as well, I'd just as soon not scour e-bay for a model that's correct for the period. Or at least not right now; more interested in keeping up the momentum of regular riding.

Do I need a long cage or a short cage? Or does it not really matter for my gear ranges?
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Old 07-04-15, 08:18 PM
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yes you require a long cage derailleur
while not the best, the shimano 7sis should work fine, ride it as is, find a local bike co-op and learn to fix it your self
they usually have plenty of good used parts cheap, so you should have no problem finding one you like better
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Old 07-04-15, 08:19 PM
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To prevent any "accidents", run a long cage. That way if you ever find your self in a "big chainwheel-big rear cog" combo by accident, you won't tear up the derailleur.
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Old 07-04-15, 08:39 PM
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A long cage gt suntour cyclone would be pretty nice.
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Old 07-04-15, 09:07 PM
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You already have the Shimano installed. If it works well, leave it alone. Probably no benefit to getting a "better" derailleur other than saving an ounce or 2.
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Old 07-04-15, 09:30 PM
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^this!
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Old 07-04-15, 09:41 PM
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The Pro Tour was a top of the line, company flagship model bike. It had THE BEST components available. Everything on that bike was the top of the line touring/ATB parts. IMO putting a "whatever the ****" dérailleur on that bike is disrespectful to the bike.

If'n it were mine, I'd scour EBay for a Suntour XC or XC Pro or XC Comp- or if you wanted to go Shimano- Deore XT M730- M735 or Deore MT60/62.

If it came with a LeTech, I can see not wanting to roll with a triple pivot RD- but that is one of the best- the Suntour XC was the next best for that time.

Of course, I'm a dork about this kind of stuff...
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Old 07-05-15, 12:09 AM
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^ And it's Ok to be a dork. Especially if you have a dorkily-deep parts bin. I'd put a a LeTech, Mountech, XC-Sport, Cyclone M-II, VG-T or ARx long cage derailleur on it, but mostly because I have at least one of each sitting in a box in a file cabinet about 30 feet from where I'm sitting right now.

But really, the Shimano SIS is just fine for getting around; don't have to get anal about it.
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Old 07-05-15, 05:16 AM
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When I damaged the original Cyclone on my '78 about a year ago, I put on a Shimano Acera, which I suppose is mediocre, but it works well with the large range, modern chain and modern 8 speed cassette that I have on it. It also doesn't look too modern. It was relatively inexpensive and I was able to buy it on a Sunday when I needed it.

The quality level of that derailleur is way below that of your bike, but it buys you some time to find an appropriate upgrade.
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Old 07-05-15, 08:05 AM
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Originally Posted by Lascauxcaveman View Post
^ And it's Ok to be a dork. Especially if you have a dorkily-deep parts bin.
... or Ebay

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Old 07-05-15, 09:45 AM
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Originally Posted by lord_athlon View Post
That looks like a le-tech.
Interesting. As I said, it's risky to trust a 31 year old memory. And just because I bought mine in 1984 doesn't mean that the components match the 1984 catalog. I noticed that the catalog has inconsistencies; the specs indicate a 28 sprocket lowest gear for the crankset, which matches my bike, while the Pro Tour blurb refers to a "stock 27 inch low gear."
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Old 07-05-15, 09:52 AM
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Originally Posted by tttny View Post
Interesting. As I said, it's risky to trust a 31 year old memory. And just because I bought mine in 1984 doesn't mean that the components match the 1984 catalog. I noticed that the catalog has inconsistencies; the specs indicate a 28 sprocket lowest gear for the crankset, which matches my bike, while the Pro Tour blurb refers to a "stock 27 inch low gear."
It's a LeTech- The giveaway is the 3rd pivot at the top of the cage arm.




I suppose it could be a Mountech II- but the LeTech was higher on the food chain and the open cage is the defining feature.

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